bannersTest.php: remove obsolete test

tests/bannersTest.php

@@ -1,24 +0,0 @@
-<?php
-use PHPUnit\Framework\TestCase;
-
-ob_start();
-require_once "banners.php";
-ob_end_clean();
-
-final class bannersTest extends TestCase
-{
-    public function testBanners(){
-
-        $expected = '<a href="banners/lain-bottom.png"><img src="banners/lain-bottom.png" alt="lain-bottom.png" style="width:348px;height:128px"></a> ';
-
-        //capture input
-        ob_start();
-            listBannersInDir("banners");
-            $output = ob_get_contents();
-        ob_end_clean();
-        //end input
-
-        //assertion
-        $this->assertEquals($output,$expected);
-    }
-}